THUMB
    AREA |.text|, CODE, READONLY


    GLOBAL |rust_psm_stack_direction|
    ALIGN 4
|rust_psm_stack_direction| PROC
    movs r0, #2
    bx lr
    ENDP

    GLOBAL |rust_psm_stack_pointer|
    ALIGN 4
|rust_psm_stack_pointer| PROC
    mov r0, sp
    bx  lr
    ENDP


    GLOBAL |rust_psm_replace_stack|
    ALIGN 4
|rust_psm_replace_stack| PROC
    mov sp, r2
    bx r1
    ENDP


    GLOBAL |rust_psm_on_stack|
    ALIGN 4
|rust_psm_on_stack| PROC
    push {r4, lr}
    mov r4, sp
    mov sp, r3
    blx r2
    mov sp, r4
    pop {r4, pc}
    ENDP

    END